As we all know, it is best to sleep 7 to 8 hours at night, so how long is it to take a nap? When we first start edaved, we call it the period, when eye movement begins to slow down and the brain gradually stops working, but the brain is still rich in blood supply. At this stage the brain can still accept data from the senses, which is stored in the hippocampus as a short-term memory.
The hippocampus is a temporary memory station for the brain, and at this stage we are in the middle of a half-dream and half-wake, so it’s easy to wake up. And, when you wake up, the fatigue is significantly eased.
After 20 minutes of napping, we go into a shallow sleep, the eyeballs stop moving, the brain begins to rest, and the brain blemoes gradually decrease. If you wake up at this point, you will feel dizzy and experience mild nausea. We usually need an extra 35 minutes to recover, because when we wake up, the brain starts working directly, but the brain’s blood supply is temporarily unable to keep up, which we call “sleep inertia.”
After 30 minutes of napping, we go into deep sleep, when the eyeballs still stop moving and blood flow to the brain decreases further. But some areas of the brain begin to become active, suggesting that the brain is transferring narrative memories stored in the hippocampus to the cerebral cortex.
Narrative memory is a memory that can be described in words, either as a mathematical formula or as a location, and which can only be more permanent if saved to the cerebral cortex. If you wake up at this point you will have a severe “sleep inertia”, which is also caused by a lack of blood supply to the brain. You can experience symptoms such as dizziness, confusion, cognitive impairment, and it will take 35 minutes or more to recover.
After an hour’s nap, we enter a period of rapid eye movement, a feature of which is that the eyeballs move rapidly, and brain activity is similar to when we are awake. At the same time, the brain’s blood flow increased significantly, and the brain began to clean up unwanted memories and rearrange some irrelevant memories, creating strange dreams.
As for why the brain does this? There are many opinions in the scientific community, one of which holds that dreams are the brain’s process of constantly strengthening memory. At this stage, procedural memory is consolidated.
Procedural memory is the skills we usually learn, such as driving, swimming, playing the piano. Since there is enough blood in the brain at this stage, there is no discomfort when you wake up. And the dream of the sky will stimulate your creativity, your physical strength, brain will be significantly restored.
In fact, our night’s sleep is a 60-minute “nap” cycle, which we call the “sleep cycle.” Among them, the sleep period, the shallow sleep period, the deep sleep period and the rapid eye movement period are the different stages of the sleep cycle.
Simply put, a light and deep sleep time wake-up can trigger sleep inertia, and it takes an extra 35 minutes to recover from a variety of discomforts. When you wake up during the sleep period, you will feel a significant relief from fatigue. Waking up during a rapid eye movement will consolidate your memory and be creative.